Motor controller



July 3, 1923. 1,460,562

r c. w. YERGER MOTOR CONTROLLER Filed June 23, 1919 IN V EN TOR.

ATTORNEY Patented July 3, 1923.

UNITED STATES Application filed June T 0 all whom it may couccm Be itknown that 1, CHARLES il nation, a citizen of the United States.residing at. Milwaukee, in the county of M mites and State oflVisconsin, have invented new and useful Improvements in MotorControllers, of Which the following is a full. clee coucise, and exactdescription. reieien had to the accompanying t rawing. i

a part of this specification,

This invention relates to motor controllers and more particularly tothose of the drum type.

One of the objects of the present invention is to provide a. drumcontroller of simplified construction to afford num iier of steps ofcontrol.

Another object is to provide a drum controller affording a given numberof steps of control with a reduced number ot sets of co-operatingcontacts and with consequent saving of contact material and reduction insize of the controller.

Another object is to provide a drum con troller of the aforesaidcharacter wherein the co-operating contacts are 0 such number andarrangement: to min mize the quired number of insulated drum sectionsand to otherwise simplify the construction of the drum.

Various other ob lects and advantages ot the invention will hereinafterappear.

The accompanying drawing illustrates certain embodiments of theinvention which will now be described, it being understood that theinvention may be embodied in other forms without departing from thescope of the appended claims.

In the drawing,

Figure 1 diagrammatically illustrates a non-reversing controller;

Fig. 2 diagrammatically illustrates a reversing controller; and,

Fig. 3 diagrammatically illustrates a modified reversing controlleraffording an increased number of steps of control.

Referring to F 1. the same diag matically illustrates a crum forcontrolling a motor M through the medium of three sections ofresistances r, r and r and in a manner to afi'ord siX steps of control.The motor is shown as provided with a armature a and series field falthough it is to he uuderstood that the motor might be oi any otherpreferred type.

PATENT OFFICE.

co -T33. TO THE CUTLER-HALL CORPOELATIGN OF WISCONSIN.

CON'TROLLEE.

1919. Serial No. 305,966.

The drum comprises six contact fingers 9, 3, l, 5, 6 and '7 andco-operating segments 2, 3. 3 i, 4- 5 *6 and 7. All but the last twomentioned segments are electrically connected and said last. twomentioned segments are interconnected whereby only two insulated drumsections are required and the arrangement oi the segments is such as torender said sections of simple construction. The arrangement of segmentsis such that in the first operative position of the drum segments 2 and3 engage fingers 2 and 3, while upon moven'ient of the drum to itssecond and third positions segments 4: and 5 successively engage fingersl and 5, segments and 4- disengaging their respective fingers in thethird position. Then upon movement oi the drum to its fourth positionsegments 6 and 7 engage fingers 6 and 7 while upon movement of the drumto fitth and sixth positions segments 3 and 42 successively fingers 3and 4.

The circuit 0 .mections are such that the drum in fi st positioncompletes circuit from line L through finger 2. segment 2 gineut 3 andfinger 3 to and through rcs stanres r. r and 1- in series to finger 7,by conductor 9 through the motor armature a and series field f to lineL. Then when the drum is moved to its second position it short circuitsresistance 1* through finger 3. segment 3. segment at and finger 4,whereas said drum when moved to its third position completes circuitfrom finger 2 through segments 2 and to finger 5 and thence to andthrough resistance r while resistances 1' and r are disconnected fromthe line. This provides for gradually increasing the cur rent suppliedto the motor and when the drum moved to its fourth position anadditional circuit is completed from finger 5 through resistance r tofinger l, by con ductor 9 to finger (3 and thence through segments (3and to finger 7. thus paralleling resistance r with resistance r tofurther in crease the current supplied to the motor. Then when the drumis moved to its fifth position an additional circuit is established fromL through finger 2. segment 2, segment 8 and finger 3 to and throughresistance r to contact finger 4 by conductor 9 to finger 6 and thenceto finger 7, thus parallelin; all three resistances r, r and "r tofurther increase the current supplied to the motor. lnally when the drumis moved to its sixth position circuit is completed from line L throughfinger 2, segment 2, segment 4t and finger 1 by conductor 9 to finger 6and thence through segments 6 and 7 to finger 7, thus throwing the motordi rectly on the line for maximum current.

Referring to Fig. 2, the same illustrates a drum for controlling themotor M through the medium of resistances 1*, r and r in precisely thesame manner as that above described, but, also providing for reversal ofsaid motor. This: controller is provided with contact finger 11, 12, 13and 1-1 and two opposed sets of CO-QPGFZltlIlg segments, each of saidsets including segments 11 12, 12 13, 13 and 14 and being identical withthe set of segments shown in Fig. 1 to provide for establishment of theabove described connections upon reverse operations of the drum.Further, the drum includes contact fingers 15 to and two opposed sets ofco-operating segments, one set ineluding segments 16 to 20 nd. the otherse including segments 15 to 19 The former set of segments engage fingers16 to 20 when the drum is moved in one direction while the latter set ofsegments engage fingers 15 to 19 when the drum is moved in a reversedirection, the segments 18 and 18 however being arranged to engagefinger 18 only in the fourth, fifth and sixth positions of the drum. Thesegments 16 17 and 18 are interconnected but are electricallyindependent of segments 19 and 20 which are interconnected, while thesegment 15 and 16 are interconnected bu t are elet r cally in dependentof segments 17. 18 and 19 which are interconnected. Here it may be notedthat V lesser number or .mgers and segments in it be employed to effectthe des red circuit changes but a drum of the construction illustratedis advantageous in that only three insulated drum sections are re ouiredand. said drum sections are of simple construction.

The circuit connections are such that the segments 16, 17", 19 and 20co-operate with fingers 16, 17 19 and 20 to establish forward runningconnections for the motor while segments 15, 16 17 and 19 co-operatewith fingers 15, 16, 17 and 19 to establish reverse running connectionsfor the motor, reversals heing effected by reversing the direction offlow of current through the motor armature. More specifically. segments16* and 1 when in engagement with fingers 16 and 17 complete circuitfrom the resistance r to the left hand terminal of the motor armature,while segment 19 and 20 when in engagement with fingers 19 and 20connect the right hand terminal of the motor armature to the seriesfield. On the other hand segments 15 and 16 when in engagement withfingers and 1G connect the left hand ten fr'xiinal of the mot r armaturto the series field while segments 17 and 19 when in engagement. withfingers 17 and 19 connect the right hand terminal of the armature toresistance 9- thus reversing the flow of current through the armature.Further, the circuit connections are such that the right hand set ofsegments 11, etc, together with the segments 17 and 1S co-operate withcontact fingers 11, 12, 13, 14:, 17 and 18 to afford precisely the samecontrol as described in connection with Fig. 1, while the left hand setof segments 11 etc, together 'ith segments 17" and 18 cooperate with thesame fingers to effect like control upon reverse operation of the drum.

Referring to Fig. 3, the same illustrates a drum for controlling motor Mthrough the n'iedium of four resistance sections 1 7-, 1' and 1" toafford eight steps of control. The drum in this instance compriseseleven contact fingers 26 to 36, inclusive, two opposed sets of segmentsidentical with those shown in 2 for co-operating with fingers 31 to 36to effect reversals of the current through the motor armature and forassisting in the resistance control and with two opposed sets ofsegn'ients to co-operate with contact fingers 26 to for resistancecontrol. The last two mentioned sets of segments are identical, eachcomprising segments 26, 27", 27", 28 28 29, 29 and 30. These segmentsare so arranged that when the drum moved in either direction to itsfirst operative position, segments 26 and 27 of one set engage contactfingers 2G and 27 while continued movement to the second, third andfourth positions 'auses segments 28, 29 and 30 to successively engagefingers 28, 29 and 30 respectively. Then when the drum is moved to itsfifth position, segment 29 is disengaged from finger 29. while segment34:". or segment 34.", as the case may be, is cngagedwith finger 34;.and continued movement of the drum to its sixth, seventh and eighthpositions causes segments 27", 28 and 29 to successi ely engage segments27, 28 and 29.

The circuit connections are such that when the drum is in its firstoperative position circuit is completed from line L to finger 26, bysegments 26 and 27 of one set to finger 27 and thence throughresistances 1 r" and 7 and 1' in series to and through the motor asdescribed in connection with Fig. 2. Then when the drum is moved to itssecond position, segment 28 engages finger 28 to short circuitresistance 7' and upon movement of the drum to its third positionsegment 29 engages finger 29 to short circuit resistance r while ponmovement of the drum to its fourth position segment 30 engages finger 30to short circuit resistance r. This pr0- vides for gradually increasingthe current si'ipplied to the motor and when the drum s moved. to itsfifth position an additional circuit is established from contact finger30 through resistance r by conductor 37 to finger 34c and thence throughsegment 34? or 34 to the motor as previously described, thus parallelingresistances and 1 for further increase in the current supplied to themotor. Then when the drum is moved to its sixth position. an additionalcircuit is established from line L to and through finger 26, segments 26and 27 to finger Q7 and thence through resistances r and 7* in s tofinger 29, thus placing the series connected resistances r ands inparallel with the resistances r and r for further increasing the motorcurrent, while movement of the drum to its seventh position shortcircuits resistance r by engagement of segments 27 and 28 with fingers27 and 28. This places resistances r*, r and r in parallel for a furtherincrease in the current supplied to the motor and finally in the eighthposition of the drum circuit is completed from line L to finger 26,thence through segments 26 and 29 to finger 29 by conductor 37 to finger34k and thence directly to the motor as previously traced, which throwsthe motor directly on. the line.

What I claim as new and desire to secure by Letters Patent is:

1. In a motor controller, in combination, a plurality of resistancesections and a contact drum for progressively excluding certain of saidresistance sections when con nected in series, then progressivelyconnecting certain of said resistance sections in parallel and finallyexcluding al of said resistance sections from circuit, said drum havingcontact fingers and co-operating segments, the latter divided into buttwo electrically independent groups spaced axially of the drum forarrangement thereof in a non-overlapping relation.

2. In a motor controller, in combination, a plurality of seriesconnected resistance sections and a contact drum having contact fingersand segments, certain of said fingers and segments co-operating tocontrol continuity of the motor circuit and other ol said fingers andsegments co-operating to exclude certain of said resistance sectionsfrom circuit then parallel certain of said resistance sections andfinally to exclude all of said resistance sections from circuit thesegments being divided into electrically independent groups spacedaxially of the drum and the number of said latter contact fingers beingnot in excess of the number of said resistance sections by more thantwo.

3. In a motor controller, in combination, a plurality ot' seriesconnected resistance sections and a contac" drum having oopcrat- 1reversals or the motor, lude certain of said resistance sections l andto thereafter parallel ceran of said resistance sections, certain. ofsaid contacts functioning both for motor reversals and resistancecontrol.

l. In a motor controller, in combination, a plurality of seriesconnected resistance sections and a contact drum having co-operatingcontact fingers and segments to effect reversals ot' the motor, toexclude certain of said resistance sections from circuit and tothereafter parallel certain of said resistance sections. said segmentsbeing divided into but three electrically independent groiu'is.

5. In a motor controller, in combination, a plurality of seriesconnected resistance sections and a contact drum having co-opcrat ingcontact fingers and segments to etlect *eversals ot the motor, toexclude certain of said resistance sections from circuit and to theeafter parallel certain of said resistance sections. said segments beingdivided into but three electrically independent groups and certain Oifingers and segments functioning both for motor reversals and resistancecontrol.

In witness whereof, I have hereunto subscribed my name.

CHARLES WV. YER-GER.

